Pheidole sexspinosa Mayr, 1870

Material examined. Kranji mangroves, 9 May 1985, D.H. Murphy leg., DHM-SG85- Phei-ss 1, ZRC _ ENT00000768 ; Lim Chu Kang mangrove, 10 Mar 1987, D.H. Murphy leg., DHM-SG87- Phei-ss 1, ZRC _ ENT00000769 ; same locality as previous, 27 Feb 2002, BL1101 Helpers leg., ZRC _ ENT00007572; queen and workers, Mandai mangroves, 27 Oct 1977, D.H. Murphy leg., DHM-SG77- Phei-ss 2, ZRC _ ENT00000770 ; same locality and collector as previous, 18 Oct 1977, DHM-SG77- Phei-ss 3, ZRC _ ENT00000772; same locality and collector as previous, 2 Oct 1978, ZRC _ ENT00027931; queen and workers, same locality as previous, 8 May 2018, W. Wang leg., WW-SG18- Phei 4, ZRC _ ENT00007290; Sungei Buloh Wetland Reserve, 1.4462, 103.73058, 14 Mar 2018, W. Wang leg., WW-SG18- Phei 3, ZRC _ ENT00000908-909 ; same locality as previous, 1.4472, 103.72537, 20 Dec 2018, W. Wang & M.S. Foo leg., WW-SG18- Phei 5, ZRC _ ENT00007644 .

Material not physically examined. Unknown.

Literature. Wang et al. (2018b).

Localities. Kranji mangroves; Lim Chu Kang mangrove; Mandai mangroves; Sungei Buloh Wetland Reserve.

Habitat/Ecology. This species is associated exclusively with mangrove habitats in Singapore. Nests can be found in abandoned Thalassina (a.k.a mud lobsters) mounds — sometimes shared with other invertebrates including the mangrove trap-jaw ant Odontomachus litoralis, cable roots of mangrove trees such as Excoecaria agallocha L., or in decayed or living stems of Rhizophora above tide inundation levels.